改进的零注入约束双线性WLAV状态估计

实际电网中存在许多注入功率严格为零的零注入节点,零注入节点的注入功率量测为绝对准确的量测量,但这些测量并没有得到充分利用。因此,通过注入功率为零的节点建立功率约束方程作为对状态估计的约束条件,再对极坐标系下的电力系统非线性量测方程进行两步线性化,得到计及零注入约束的双线性抗差状态估计方程,用约束方程对第一步线性过程结果进行修正。最终结果证明该算法在提高估计精度的基础上,不会增加系数矩阵的阶数,且改进后的算法仍然拥有较高的计算效率。国内某实际省网以及选取的IEEE标准系统的仿真结果证明了该方法能有效提高计算精度和计算效率。

Modified bilinear WLAV state estimation with zero injections

There are many zero injection nodes with zero injection power in the actual power grids, and the injection power of zero injection nodes is measured as absolute accurate measurement, but these measurements are not fully utilized. In the state estimation, the result of the first step linear process of the bilinear WLAV state estimation is modified by the zero injection constraint, which not only improves the estimation accuracy, but also does not increase the order of the coefficient matrix, and the improved algorithm still has a higher computational efficiency. Simulation results based on the IEEE standard systems and a real provincial network verify the effectiveness of the proposed method in improving the computation accuracy and computing efficiency.